Comparison of mail servers ~ Informatics Engineering ~ 2256 ~ afternoon-college-program-blended.prestasi.web.id

This is a comparison of mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services.

Note

Linux based mail servers are built using a number of components due to the fact a Linux environment is by default a multi-user operating system. When you deploy a Linux server it already has internal mail. To allow this server to send external emails you need a MTA (Mail Transfer Agent) such as sendmail, postfix and exim. If you wish users to not have direct access to the server and have to physical login to read their emails, then you need to give those users access to the emails received by the MTA, then you install an additional service like Dovecot or UW IMAP which provide the POP and IMAP services for your mail server.

1 Feature comparison
2 Authentication
3 Antispam Features
4 See also
5 Notes and references

Feature comparison

00000 !	00000 !Server OS support			00000 !Features											00000 !Storage			00000 !
Mail server	Linux/Unix	Windows	Mac OS	SMTP	POP3	IMAP	IMAP IDLE	SMTP over TLS	POP over TLS	IPv6	NNTP	SSL	Webmail	ActiveSync	Database	Filesystem	Other	License
agorum core	Yes	Yes	No	Yes	No	Yes	?	No	No	?	No	Yes	Yes	No	Yes	No	No	GPLv2
Apache James	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	No	No	Yes	Yes	No	ASLv2
Atmail	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	Yes	Yes	Yes	No	Proprietary (100 user/30 day demo)
Axigen	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Ajax & Basic	Yes	No	No	Yes	Proprietary (free version: email 100 users / calendar 5 users)
Citadel	Yes	No	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	?	Yes	Yes	No	Yes	No	No	GPLv3
CommuniGate Pro	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Proprietary (Free for up to 5 users)
Courier Mail Server	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	No	No	maildir	No	GPLv3^[1]
Cyrus IMAP	Yes	No	Yes	No	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	No	No	Yes (indexes)	Yes	Yes	4-clause BSD^[2]
DBMail	Yes	via Cygwin	Yes	Postfix, Exim, Sendmail, qmail	Yes	Yes	Yes	Postfix, Exim, Sendmail, qmail	Yes	Yes	?	Yes	No	No	PostgreSQL, MySQL, SQLite	No	No	GPLv2^[3]
Digital Integration iMail5	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary
Dovecot	Yes^[4]	No^[4]	Yes^[4]	No	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	No	No	Yes	maildir, mbox, dbox	No	Mixed: MIT and LGPL 2.1^[5]
Eudora Internet Mail Server	No	No	Yes	Yes	Yes	Yes	?	No	No	?	No	No	No	No	No	No	Yes	Proprietary
Exim	Yes	Yes (via Cygwin)	Yes	Yes	Dovecot, UW IMAP	Dovecot, UW IMAP	Dovecot, UW IMAP	Yes	No	Yes	No	Yes	No	No	Yes	Yes	No	GPLv2+^[6]
FirstClass	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Proprietary
Gordano Messaging Suite	Yes	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary
GroupWise	Yes	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	?	Yes	Yes	Yes	Yes	No	No	Proprietary
Hexamail Server	Yes	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	No	Yes	No	Proprietary
Mail server	Linux/Unix	Windows	Mac OS	SMTP	POP3	IMAP	IMAP IDLE	SMTP over TLS	POP over TLS	IPv6	NNTP	SSL	Webmail	ActiveSync	Database	Filesystem	Other	License
hMailServer	No	Yes	No	Yes	Yes	Yes	Yes	V 5.0	V 5.0	Yes	No	V 5.0	Yes	No	Yes	No	No	GNU GPL (V5.0 Proprietary)
IBM Lotus Domino	Yes	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	No	No	Proprietary
IndiMail	Yes	No	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	No	Yes	No	No	Yes	Yes	No	GPLv3
Ipswitch IMail Server	No	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	Yes	No	Yes	No	Proprietary
JMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Proprietary
Kerio Connect	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	?	Yes	Yes	Yes	Yes	Yes	Yes	No	Proprietary
Kolab	Yes	No	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	GPLv3
MagicMail	Yes	No	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary
Mailsite	No	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	Yes	Yes	Yes	Yes	Proprietary
Mailtraq	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	Yes	No	Yes	Yes	Yes	Proprietary
masqmail	Yes	No	Yes	Yes	No	No	No	Yes	No	Yes	No	Yes	No	No	No	Yes	Yes	GPL
MDaemon Mail Server	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	Yes [Requires one time fee] ^[7]	Yes [Requires one time fee]	Yes	No	Proprietary
Mercury Mail Transport System	No	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	No	Yes	No	Proprietary donationware
Microsoft Exchange Server	No	Yes	No	Yes	Yes	Yes	Yes^[8]^[9]	Yes	Yes	Yes (2007 sp1 onwards)^[10]	Yes	Yes	Yes	Yes	ESE only	Yes (up to 2003 only)^[11]	Yes	Proprietary
Mirapoint	Yes	No	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary
NetMail	Yes	Yes	No	Yes	Yes	Yes	?	Yes	Yes	?	?	Yes	Yes	No	Yes	No	No	Proprietary
OpenSMTPD	Yes	No	Yes	Yes	No	No	No	Yes	No	Yes	No	Yes	No	No	possible through custom backends	Yes	No	ISC
Open-Xchange	Yes	No	No	Yes	Yes	Yes	?	Yes	Yes	?	?	Yes	Yes	Yes	Yes	No	No	Proprietary/SaaS, with open-source parts^[12]
Mail server	Linux/Unix	Windows	Mac OS	SMTP	POP3	IMAP	IMAP IDLE	SMTP over TLS	POP over TLS	IPv6	NNTP	SSL	Webmail	ActiveSync	Database	Filesystem	Other	License
Oracle Communications Messaging Server	Yes	No	No	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	Yes	No	Yes	Yes	No	Proprietary
Postfix	Yes	No	Yes	Yes	Dovecot, UW IMAP	Dovecot, UW IMAP	Dovecot, UW IMAP	Yes	No	Yes	No	Yes	No	No	Yes	Yes	Yes	IBM Public License
qmail	Yes	No	Yes	Yes	Yes	Dovecot, UW IMAP	Dovecot, UW IMAP	No	Dovecot, UW IMAP	via Qsmtp	?	No	No	No	(cdb)	Yes	No	Public domain
Qpopper	Yes	via Cygwin	Yes	No	Yes	No	No	No	Yes	?	No	Yes	No	No	No	Yes	Yes	BSD-style, GPL-incompatible^[13]
Sendmail	Yes	No	Yes	Yes	Dovecot, UW IMAP	Dovecot, UW IMAP	Dovecot, UW IMAP	Yes	No	Yes	No	Yes	No	No	?	Yes	?	Sendmail License
SparkEngine	Yes	Yes	Yes	Yes	No	No	No	Yes	No	?	No	Yes	No	No	Yes	Yes	Yes	Proprietary
SurgeMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	No	Yes	Yes	Yes	Proprietary (free for up to 5 users)
Synovel Collabsuite	Yes	No	No	Yes	Yes	Yes	?	Yes	Yes	?	?	Yes	Yes	No	Yes	Yes	?	Proprietary with OSS parts, Freeware and paid editions^[14]
UW IMAP	Yes	Yes	Yes	No	Yes	Yes	Yes	No	Yes	?	No	Yes	WebPine	No	Yes (Indexes)	Yes	No	Apache License 2.0^[15]
WinGate	No	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	No	No	Yes	No	Proprietary
Xeams	Yes	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	?	No	Yes	No	No	No	Yes	No	Freeware with support option
Zarafa	Yes	No	No	External^[16]	Yes	Yes	Yes	External^[16]	Yes	No	No	Yes	Yes	Yes	Yes	Yes	No	AGPLv3, free and paid editions^[17]
Zimbra	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes	No	No	Yes	Yes	Yes	Yes	Yes	No	ZPL and proprietary editions^[18]
Mail server	Linux/Unix	Windows	Mac OS X	SMTP	POP3	IMAP	IMAP IDLE	SMTP over TLS	POP over TLS	IPv6	NNTP	SSL	Webmail	ActiveSync	Database	Filesystem	Other	License
zzzzz !	zzzzz !Server OS support			zzzzz !Features											zzzzz !Storage			zzzzz !

Authentication

Mail server	SMTP AUTH	POP before SMTP	APOP	Filesystem	Database	LDAP	Other
agorum core	Yes	No	No	No	Yes	Yes	PLAIN, LOGIN, CRAM-MD5, NTLM
Apache James	Yes	?	?	?	Yes	Yes	PLAIN, LOGIN
Atmail	Yes	Yes	Yes	Yes	Yes	Yes	PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, Active Directory, any LDAP-compatible source
Axigen	Yes	No	Yes	No	No	Yes	GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, CLRTXT, LOGIN, PLAIN, LDAP, Internal
CommuniGate Pro	Yes	Yes	Yes	Yes	Yes	Yes	Active Directory (LDAP), CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID, External Authentication Plug-in. Also supports X.509 PKI auth via STARTTLS/SSL
Courier Mail Server	Yes	Yes	Yes	Yes	Yes	Yes	Managed by Courier authentication library which can use PAM, Userdb, PostgreSQL(beta), MySQL, LDAP, and EXTERNAL.
Cyrus IMAP	No	Yes	Yes	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.
Cyrus SASL Library	No	Yes	Yes	Yes	Yes	Yes	Berkeley DB, GDBM, or NDBM (sasldb), PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), DCE, Kerberos 4 and 5, proxied IMAP auth, getpwent, shadow, SIA, Courier Authdaemon, httpform, APOP and SASL mechanisms: ANONYMOUS, CRAM-MD5, DIGEST-MD5, EXTERNAL, GSSAPI, LOGIN, NTLM, OTP, PASSDSS, PLAIN, SRP
Digital Integration iMail5	Yes	No	Yes	No	No	No
Dovecot	No	Yes	Yes	Yes	Yes	Yes	Not an SMTP server, but offers SASL to MTAs. http://wiki.dovecot.org/DovecotFeatures http://wiki.dovecot.org/Authentication. POP-before-SMTP via DRAC plugin. PAM, MySQL, PostgreSQL, SQLite, LDAP, Active Directory(LDAP), Kerberos 5, proxied IMAP auth, getpwent, shadow, SIA, BSDauth, Vpopmail. APOP and SASL mechanisms: ANONYMOUS, PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, SCRAM-SHA1, EXTERNAL, GSSAPI, NTLM, OTP, SKEY, RPA.
Eudora Internet Mail Server	Yes	No	Yes	Yes	No	No	CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN
Exim	Yes	Yes	Yes	Yes	Yes	Yes	Cyrus SASL, Dovecot SASL, CRAM-MD5, PLAIN, LOGIN, SPA
FirstClass	Yes	?	?	Yes	Yes	Yes
Gordano Messaging Suite	Yes	Yes	Yes	No	Yes	Yes	PLAIN, LOGIN, CRAM-MD5, DIGEST-MD5, APOP, ODBC, Active Directory, NT Domain
GroupWise	Yes	Yes	Yes	Yes	Yes	Yes	eDirectory, Any LDAPv3-compliant source
Hexamail Server	Yes	Yes	Yes	Yes	No	Yes	CLRTXT, CRAM-MD5, DIGEST-MD5, APOP, GSSAPI, NTLM, MSN, SESSIONID
IndiMail	Yes	Yes	No	Yes	Yes	Yes	CLRTXT, PLAIN, LOGIN, CRAM-MD5, CRAM-SHA1, CRAM-RIPEMD, DIGEST-MD5, APOP, Checkpassword, authindi, authldap, Pluggable Authentication Modules, Name Service Switch
Ipswitch IMail Server	Yes	No	Yes	Yes	Yes	Yes	Active Directory, Windows authentication, CRAM-MD5, PLAIN, LOGIN
JMail	Yes	No	Yes	No	No	No	CRAM-MD5, PLAIN, LOGIN, APOP, HTTP DIGEST. Authentication through a JID system
Kolab	Yes	Yes	Yes	Yes	Yes	Yes	Kolab employs Cyrus and Postfix and thus supports all Cyrus SASL authentication methods and X.509 PKI auth via STARTTLS and EXTERNAL.
Kerio Connect	Yes	Yes	Yes	Yes	No	Yes	Active Directory, Apple Open Directory, ActiveSync, Pluggable Authentication Modules
MagicMail	Yes	No	No	Yes	Yes	No	?
Mailsite	Yes	No	Yes	Yes	Yes	Yes	NT Domain, Active Directory, PLAIN, LOGIN, NTLM, SCRAM-MD5, CRAM-MD5
Mailtraq	Yes	Yes	Yes	Yes	Yes	Yes	NT Domain, Active Directory, Local Directory
MDaemon Mail Server	Yes	Yes	Yes	No	Yes	Yes	Active Directory, PLAIN, CRAM-MD5, LOGIN
Mercury Mail Transport System	Yes	Yes	Yes	Yes	No	?	Internal, LOGIN, PLAIN, CRAM-MD5, Netware, LDAP?, partial NT Domain
Microsoft Exchange Server	Yes	?	Yes	No	No	Yes	Active Directory, PLAIN, NTLM
Mirapoint	Yes	Yes	Yes	Yes	Yes	Yes	Plaintext, LDAP, NTLM, APOP, Kerberos_v4, Kerberos_v5, Radius, Sessionid
NetMail	Yes	Yes	Yes	Yes	Yes	Yes	eDirectory, LDAP
Oracle Communications Messaging Server	Yes	Yes	Yes	Yes	Yes	Yes	Plain, Login, CRAM-MD5, Digest-MD5, Certificate
OpenSMTPD	Yes	No	No	Yes	Yes	Yes	By default PLAIN and LOGIN over SSL only, Certificates, bsd_auth and PAM. Supports adding new authentication mechanisms through custom backends.
Postfix	Yes	No	No	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods except for APOP.
Qpopper	No	Yes	Yes	Yes	Yes	Yes	Pluggable Authentication Modules,GSSAPI, CRAM-MD5, DIGEST-MD5, APOP, PLAIN, LDAP, CMU SASL library, Kerberos
qmail	with patch	with vpopmail	Yes	Yes	Yes	Yes	Works with any checkpassword utility. The original supports only LOGIN and PLAIN. Alternate checkpassword utilities support authentication against PAM, LDAP, and databases.
Sendmail	Yes	Yes	No	Yes	Yes	Yes	Supports all Cyrus SASL authentication methods except for APOP. Also supports X.509 PKI auth via STARTTLS and EXTERNAL.
SurgeMail	Yes	Yes	Yes	Yes	Yes	Yes	Internal, LDAP, PAM, MYSQL, ODBC, Unix Password, Windows Domain or external protocol
WinGate	Yes	Yes	Yes	Yes	Yes	No	NT Domain, Active Directory, CRAM-MD5, SASL PLAIN, SASL LOGIN
Zarafa	Yes	Yes	?	Yes	Yes	Yes	Internal, Active Directory, any LDAP-compatible source, Unix
Zimbra	Yes	No	Yes	Yes	Yes	Yes	Internal, LDAP, Open LDAP, Active Directory
Mail server	SMTP AUTH	POP before SMTP	APOP	Filesystem	Database	LDAP	Other

Antispam Features

Mail Server	DNSBL	SURBL	Spamtraps	Greylisting	SPF	Tarpit	Bayesian filters	Regular expressions	Embedded Antivirus	Embedded Antispam
agorum core	No	No	No	No	No	No	No	Yes	No	No
Apache James	?	?	?	?	?	?	Yes	?	?	?
Atmail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes ClamAV	Yes SpamAssassin and Exim ACLs
Axigen	Yes	Yes^[19]	No	Yes	Yes	No	Yes, in SpamAssassin	Yes	Yes Commtouch	Yes SpamAssassin
Citadel	Yes	Yes	No	No	Optional (via SpamAssassin)	No	Optional (via SpamAssassin)	No	Optional (ClamAV)	Optional (SpamAssassin)
CommuniGate Pro	Yes	Yes	Yes	No	Yes	Yes	Optional	Yes	Optional (ClamAV)	Optional (via SpamAssassin)
Courier Mail Server	Yes	?	Yes	Yes^[20]	Yes	Yes	Yes^[20]	Yes^[20]	Yes Clamav	Yes^[20]
Digital Integration iMail5	Yes	No	No	Yes	No	No	No	Optional (GWAVA)	Optional (GWAVA)	Proprietary, Optional (GWAVA)
Dovecot	?	?	?	?	?	?	?	?	?	?
Eudora Internet Mail Server	Yes	?	Yes	Yes	?	?	?	?	?	?
Exim	Yes	Yes	Yes	Yes	Yes	Yes	Optional with spamassassin etc.	Yes	Optional any	Optional any
FirstClass	Yes	Yes	No	?	Yes	Yes	Yes	Yes	Yes Symantec	?
Gordano Messaging Suite	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes Commtouch, Authentium	Yes Commtouch
GroupWise	Yes	?	?	?	?	?	?	?	?	?
Hexamail Server	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes BitDefender	Yes
hMailServer	Yes	Yes	No	Yes	Yes	No	No	Yes	Yes ClamAV	Yes SpamAssassin
IBM Lotus Domino	Yes^[21]	?	?	?	No^[22]	?	?	?	?	?
IndiMail	Yes	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes ClamAV	Yes Bogofilter
Ipswitch IMail Server	Yes	Yes	No	No	Yes	No	Yes	Yes	Yes Symantec, BitDefender	Yes Commtouch
JMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes ClamAV and/or optional any	Yes and/or built-in
Kolab	Yes	?	?	Yes	Yes	?	Optional with spamassassin etc.	Yes	Optional (via content filter interface)	Optional (via content filter interface)
Kerio Connect	Yes	Yes	?	No	Yes	Yes	Yes	?	Optional Sophos + optional secondary (dual)	Yes
MagicMail	Yes	No	Yes	No	?	?	No	Yes	Yes	Yes
Mailsite	Yes	Yes	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
Mailtraq	?	?	?	?	?	?	?	?	?	?
MDaemon Mail Server	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Optional Kaspersky Lab	Yes
Mercury Mail Transport System	Yes	?	?	Yes (GreyWall extension)	?	?	Yes (SpamHalter extension)	?	Yes (ClamWall extension)	?
Microsoft Exchange Server	Yes (2003 & later)	?	?	Yes	Yes	Yes (2003 & later)	?	?	?	?
Mirapoint	Yes	No	Yes	Yes	Yes	Yes	Yes	Yes	Yes Commtouch, Sophos, F-Secure	Yes Commtouch, Sophos, SPamAssassin
NetMail	?	?	?	?	?	?	?	?	?	?
Oracle Communications Messaging Server	Yes	Yes	Yes	Yes	Yes	Yes	Optional with spamassassin etc.	Yes	Optional any	Optional any
Postfix	Yes	?	?	Yes	Yes	?	Optional with spamassassin etc.	Yes	Optional (via content filter interface)	Optional (via content filter interface)
qmail	?	?	?	Yes	?	?	No	?	No	No
Sendmail	Yes	Yes (via milter/SA)	?	Yes	Optional	?	?	?	Yes ClamAV	Yes SpamAssassin
SparkEngine	?	?	?	?	?	?	?	?	?	?
SurgeMail	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Synovel Collabsuite	Yes	Yes	Yes	Yes	Yes	?	Yes	Yes	YesClamAV	Yes SpamAssassin
UW IMAP	?	?	?	?	?	?	?	?	?	?
WinGate	?	?	?	?	?	?	?	?	?	?
Zarafa	No^[16]	No^[16]	No^[16]	No^[16]	No^[16]	No^[16]	No^[16]	No^[16]	No	No
Zimbra	Yes	?	?	?	?	?	?	?	Yes ClamAV	Yes SpamAssassin
Mail Server	DNSBL	SURBL	Spamtraps	Greylisting	SPF	Tarpit	Bayesian filters	Regular expressions	Embedded Antivirus	Embedded Antispam

Notes and references

^ See COPYING file in the distribution
^ https://cyrusimap.org/mediawiki/index.php/Downloads#Licensing
^ http://git.dbmail.eu/paul/dbmail/tree/README
^ ^a ^b ^c Dovecot Operating System Compatibility. Retrieved on 2008-09-03.
^ "Dovecot licensing information: COPYING". http://www.dovecot.org/doc/COPYING. Retrieved 2008-09-03.
^ See NOTICE file in the distribution
^ ActiveSync for MDaemon
^ http://technet.microsoft.com/en-us/library/cc540463(EXCHG.80).aspx
^ http://technet.microsoft.com/en-us/library/ff848256.aspx
^ http://technet.microsoft.com/en-us/library/bb629624(EXCHG.80).aspx
^ Exchange Installable File System (ExIFS)
^ http://www.open-xchange.com/misc/licenses/
^ Contains jurisdiction selection and IBM Public License-style indemnification clause.
^ http://www.synovel.com/collab/editions
^ UW IMAP Server Documentation
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Zarafa Collaboration Platform architecture diagram. Retrieved on 2011-12-10.
^ http://www.zarafa.com/content/scope-and-benefits
^ [1]
^ via Kaspersky anti-spam add-on
^ ^a ^b ^c ^d with Courier-pythonfilter filtering framework
^ http://www-01.ibm.com/support/docview.wss?uid=swg21102611
^ http://www-01.ibm.com/support/docview.wss?rs=463&context=SSKTMJ&dc=DB520&uid=swg21227751&loc=en_US&cs=UTF-8&lang=en&rss=ct463lotus

Comparison of mail servers

Contents

Feature comparison

Authentication

Antispam Features

See also

Notes and references